Song Da No. 11 Joint Stock Company, together with its subsidiaries, engages in the construction business in Vietnam. The company builds hydropower projects, irrigation, and traffic and post offices; and builds, experiments, adjusts, maintains, and installs industrial electrical cabinets and boards for electrical lines, power plants, transformer stations, and technological lines. It also manages, operates, and distributes electricity and water for various projects; exploits sand, gravel, and stone for building roads and construction; and produces and trades in metal, mechanical products, machinery, electrical equipment and supplies, and other machine spare parts. In addition, the company engages in coke production; technical examination and analysis; and investment in solar and hydroelectric power plant projects. Further, it is involved in commercial electricity generation, transmission, and distribution. The company was founded in 1961 and is headquartered in Hanoi, Vietnam. Song Da No. 11 Joint Stock Company operates as a subsidiary of ENERGY Viet Nam Investment JSC.